Ononot — A truck travels 180 km at 60 km/h, then returns 180 km at 45

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A truck travels $180$ km at $60$ km/h, then returns $180$ km at $45$ km/h. Which statement(s) correctly describe(s) the average speed for the entire round trip?\n\n(I) The average speed is exactly $52.5$ km/h\n(II) The average speed equals the harmonic mean of the two speeds\n(III) The average speed is less than the arithmetic mean of the two speeds